Android—图片相册选择和相机拍照
星光不负赶路人,时间不负有心人
文章目录
- Android---图片相册选择和相机拍照
- 效果
- 获取权限,导入依赖
- 危险权限和普通权限
- 获取权限的案例
- 读取用户相册
- 点击事件读取相册
效果
获取权限,导入依赖
// 图片选择控件
implementation 'io.github.lucksiege:pictureselector:v2.7.2'
// 让用户同意权限的弹窗如何调出来呢,我们使用第三方开源控件
implementation 'com.yanzhenjie:permission:2.0.3'
// 网络图片的加载
implementation 'com.github.bumptech.glide:glide:4.12.0'
- 增加文件读写的权限
- 第三个是照相机的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
android:requestLegacyExternalStorage="true"
文件的读写权限和我们以前学习的网络权限等等有些区别,它属于危险权限
危险权限和普通权限
从 Android6.0 开始,Google调整了应用的权限申请方案。调整之后将权限分级,分成了普通权限和危险权限普通权限的授权方式跟之前一样,只需要在 Manifest 文件中申明即可
危险权限不仅需要在 Manifest 文件中声明,还需要在程序中调用官方提供的Api主动申请
危险权限有如下九种:读取联系人;打电话;读取用户日历信息;相机权限;传感器,获取用户位置;读取用户SD卡(拍的照片视频都在这里);多媒体(录音);短信。
获取权限的案例
AndPermission.with(this)
.runtime()
.permission(Permission.WRITE_EXTERNAL_STORAGE, Permission.CAMERA)
.onGranted(permissions -> {
Toast.makeText(MainActivity2.this, "授权成功!", Toast.LENGTH_SHORT).show();
})
.onDenied(permissions -> {
//用户拒绝->强制退出app
Toast.makeText(MainActivity2.this, "未获取权限不能使用本app!", Toast.LENGTH_SHORT).show();
System.exit(0);
})
.start();
如果用户不允许以上权限,用户拒绝,市面上大多数APP则会直接退出。
读取用户相册
建GlideEngine.java类
官方代码,直接使用
package com.huncm.xiaotang;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.graphics.drawable.RoundedBitmapDrawable;
import androidx.core.graphics.drawable.RoundedBitmapDrawableFactory;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.target.BitmapImageViewTarget;
import com.bumptech.glide.request.target.ImageViewTarget;
import com.luck.picture.lib.engine.ImageEngine;
import com.luck.picture.lib.listener.OnImageCompleteCallback;
import com.luck.picture.lib.tools.MediaUtils;
import com.luck.picture.lib.widget.longimage.ImageSource;
import com.luck.picture.lib.widget.longimage.ImageViewState;
import com.luck.picture.lib.widget.longimage.SubsamplingScaleImageView;
public class GlideEngine implements ImageEngine {
/**
* 加载图片
*
* @param context
* @param url
* @param imageView
*/
@Override
public void loadImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {
Glide.with(context)
.load(url)
.into(imageView);
}
/**
* 加载网络图片适配长图方案
* # 注意:此方法只有加载网络图片才会回调
*
* @param context
* @param url
* @param imageView
* @param longImageView
* @param callback 网络图片加载回调监听 {link after version 2.5.1 Please use the #OnImageCompleteCallback#}
*/
@Override
public void loadImage(@NonNull Context context, @NonNull String url,
@NonNull ImageView imageView,
SubsamplingScaleImageView longImageView, OnImageCompleteCallback callback) {
Glide.with(context)
.asBitmap()
.load(url)
.into(new ImageViewTarget<Bitmap>(imageView) {
@Override
public void onLoadStarted(@Nullable Drawable placeholder) {
super.onLoadStarted(placeholder);
if (callback != null) {
callback.onShowLoading();
}
}
@Override
public void onLoadFailed(@Nullable Drawable errorDrawable) {
super.onLoadFailed(errorDrawable);
if (callback != null) {
callback.onHideLoading();
}
}
@Override
protected void setResource(@Nullable Bitmap resource) {
if (callback != null) {
callback.onHideLoading();
}
if (resource != null) {
boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(),
resource.getHeight());
longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE);
imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE);
if (eqLongImage) {
// 加载长图
longImageView.setQuickScaleEnabled(true);
longImageView.setZoomEnabled(true);
longImageView.setDoubleTapZoomDuration(100);
longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP);
longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER);
longImageView.setImage(ImageSource.bitmap(resource),
new ImageViewState(0, new PointF(0, 0), 0));
} else {
// 普通图片
imageView.setImageBitmap(resource);
}
}
}
});
}
/**
* 加载网络图片适配长图方案
* # 注意:此方法只有加载网络图片才会回调
*
* @param context
* @param url
* @param imageView
* @param longImageView
* @ 已废弃
*/
@Override
public void loadImage(@NonNull Context context, @NonNull String url,
@NonNull ImageView imageView,
SubsamplingScaleImageView longImageView) {
Glide.with(context)
.asBitmap()
.load(url)
.into(new ImageViewTarget<Bitmap>(imageView) {
@Override
protected void setResource(@Nullable Bitmap resource) {
if (resource != null) {
boolean eqLongImage = MediaUtils.isLongImg(resource.getWidth(),
resource.getHeight());
longImageView.setVisibility(eqLongImage ? View.VISIBLE : View.GONE);
imageView.setVisibility(eqLongImage ? View.GONE : View.VISIBLE);
if (eqLongImage) {
// 加载长图
longImageView.setQuickScaleEnabled(true);
longImageView.setZoomEnabled(true);
longImageView.setDoubleTapZoomDuration(100);
longImageView.setMinimumScaleType(SubsamplingScaleImageView.SCALE_TYPE_CENTER_CROP);
longImageView.setDoubleTapZoomDpi(SubsamplingScaleImageView.ZOOM_FOCUS_CENTER);
longImageView.setImage(ImageSource.bitmap(resource),
new ImageViewState(0, new PointF(0, 0), 0));
} else {
// 普通图片
imageView.setImageBitmap(resource);
}
}
}
});
}
/**
* 加载相册目录
*
* @param context 上下文
* @param url 图片路径
* @param imageView 承载图片ImageView
*/
@Override
public void loadFolderImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {
Glide.with(context)
.asBitmap()
.load(url)
.override(180, 180)
.centerCrop()
.sizeMultiplier(0.5f)
.placeholder(R.drawable.picture_image_placeholder)
.into(new BitmapImageViewTarget(imageView) {
@Override
protected void setResource(Bitmap resource) {
RoundedBitmapDrawable circularBitmapDrawable =
RoundedBitmapDrawableFactory.
create(context.getResources(), resource);
circularBitmapDrawable.setCornerRadius(8);
imageView.setImageDrawable(circularBitmapDrawable);
}
});
}
/**
* 加载gif
*
* @param context 上下文
* @param url 图片路径
* @param imageView 承载图片ImageView
*/
@Override
public void loadAsGifImage(@NonNull Context context, @NonNull String url,
@NonNull ImageView imageView) {
Glide.with(context)
.asGif()
.load(url)
.into(imageView);
}
/**
* 加载图片列表图片
*
* @param context 上下文
* @param url 图片路径
* @param imageView 承载图片ImageView
*/
@Override
public void loadGridImage(@NonNull Context context, @NonNull String url, @NonNull ImageView imageView) {
Glide.with(context)
.load(url)
.override(200, 200)
.centerCrop()
.placeholder(R.drawable.picture_image_placeholder)
.into(imageView);
}
private GlideEngine() {
}
private static GlideEngine instance;
public static GlideEngine createGlideEngine() {
if (null == instance) {
synchronized (GlideEngine.class) {
if (null == instance) {
instance = new GlideEngine();
}
}
}
return instance;
}
}
点击事件读取相册
ImageView imageView = findViewById(R.id.imageViewhjc);
findViewById(R.id.buttonhjc).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PictureSelector.create(MainActivity.this)
.openGallery(PictureMimeType.ofAll())
.imageEngine(GlideEngine.createGlideEngine())
.forResult(new OnResultCallbackListener<LocalMedia>() {
@Override
public void onResult(List<LocalMedia> result) {
// onResult Callback
for (LocalMedia localMedia : result){
Log.i("MainActivity",localMedia.getPath());
}
System.out.println(result.toString());
Glide.with(MainActivity.this).load(Uri.fromFile(new File(result.get(0).getRealPath()))).into(imageView);
}
@Override
public void onCancel() {
// onCancel Callback
}
});
}
});
我们点击相册中的图片通过回调函数可以拿到图片的本地路径 /storage/emulated/0/DCIM